He'd almost certainly seen pitta bread used with a filling on his travels in the Eastern Mediterranean.

他在东地中海旅行时，几乎肯定见过皮塔馅料放在一起用。

While filled pittas, croissants and wraps have also crept in to join the basic bread and butter version.

而各种馅料的皮塔饼、牛角卷饼也加入到了原来只有基本的黄油版本的三明治大本营。